Miele DGC 6 Series, Technical Information

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Technical Information
47
DGC 6xxx
which cold air enters the main cavity. This feature is used to reduce levels of
steam at the end of a cooking cycle and to control levels of moisture during
cooking. Excess steam in the cavity is then extracted from the main cavity via
the openings in the intermediate rear panel in front of the convection fan. For
this reason the convection fan operates even during steam operation when it
runs at half speed. Fan operation also helps avoid steam layering in the main
cavity.
2.5.2 Air Flap Motor
The metallic flap narrows conically slightly in the closing area. This ensures
that it closes properly with the opening in the cavity. No outside air can then
be taken into the cavity. The flap control motor is a 12VDC motor. The motor
includes a potentiometer. This is used to establish the position of the flap and
precisely define the level of air intake. To ensure that the defined flap opening
and closing process functions correctly, an initialization activation of the flap
takes place whenever power is applied to the appliance.
This means that the flap is completely opened and closed once when the
appliance is switched on. The maximum and minimum resistance values of
the potentiometer are saved as percentages by the electronic. In this way the
desired air flap position can always be accurately set.
2.5.3 Steam Reduction
Steam reduction begins at the end of a cooking cycle. The air flap is opened
fully and cold air enters the cavity. When a temperature of 167°F is reached,
the air flap is closed. Steam reduction is finished. If the temperature in the
cavity falls further, the steam generator heating is activated again and fresh
steam is passed into the oven. This ensures that the temperature in the cavity
is maintained at 167°F for 15 minutes.
2.5.4 Air Humidity
Air humidity refers to the water vapor present in ambient air. A certain volume
of air, e.g., 1m
3
, can only absorb a certain quantity of water vapor. The
absorbed water quantity depends on the temperature. The higher the
temperature, the more water that can be absorbed. When air has absorbed
the maximum possible quantity of water, it is said to be saturated. It can then
not absorb any more water. Any water vapor in excess of the saturated
quantity is condensed out as water.
Difference between relative and absolute air humidity:

Absolute humidity is the maximum possible amount of moisture in 1m
3
of air.

Relative humidity describes the degree of saturation of air with water
vapor. A relative humidity level of 50% indicates that the air contains
half of the maximum quantity of water vapor that it could contain at the
appropriate temperature.

At temperatures of between 68°F and 212°F, the display indicates the
relative moisture which can be selected by the user.